How many mitotic division must occur in a cell of root tip to form 256 cells?

a) 256 b) 8

c)128 d)64

which one is correct?

No option is correct & right answer is 255 mitotic divisions. U can count divisions simply as follows 1+2+4+8+16+32+64+128 So to form 256 cells, 8 generations and 255division are required.